Congratulations on your new baby. Popping is MUCH easier on hatchlings then it is on older snakes, it really doesn't take much pressure to evert the hemipenes where they are so young. I personally think that popping at this age is safer then probing. I usually pop my hatchlings right after washing them off, then again after they've shed.

When my babies hatch I just rinse them off in the sink to get all the egg goop and substrate off of them, make sure the water is neither too hot or too cold. Then set them up in a shoe box with a paper towel substrate that has been dampened (but not soaking wet) and a water bowl. Then ignore them until they shed to give them a chance to settle down into their new home.